单项选择题

A．Several weeks.
B．Until your doctor tells you.
C．12 months.
D．At least 6 months.
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单项选择题
A．A shop.B．A university campus.C．A library.D．An airport.
A．A shop.
B．A university campus.
C．A library.
D．An airport.
单项选择题
A．We lose a day.B．We add 24 hours.C．We gain 12 hours.D．We add an extra month.
A．We lose a day.
B．We add 24 hours.
C．We gain 12 hours.
D．We add an extra month.
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